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Catalytic enantioselective carboannulation with allylsilanes
Nicolas R Ball-Jones1, Joseph J Badillo, Ngon T Tran
1Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616 (USA) http://chemgroups.ucdavis.edu/∼franz/
Abstract:
The first catalytic asymmetric carboannulation with allylsilanes is presented. The enantioselective [3+2] annulation is catalyzed using a scandium(III)/indapybox complex with tetrakis-[3,5-bis(trifluoromethyl)phenyl]-borate (BArF) to enhance catalytic activity and control stereoselectivity. Functionalized cyclopentanes containing a quaternary carbon center are derived from alkylidene oxindole, coumarin, and malonate substrates with high stereoselectivity. The enantioselective 1,4-conjugate addition and enantioselective lactone formation (by trapping of the β-silyl carbocation) is also described.
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